Hi Ian, and welcome to the forum. The PUS402L does mean something but exactly what is totally another question. The best i can make of it(from experience) is Procut Utility on a Steel Body (hence the PUS) the 4 denotes 4 stroke the 02 i have no idea and the L is the model run, possibly denoting the year of manufacture or the generation of the run of the model.
At the end of the day it's a later model Utility body with the drillings for either a 2 stroke powertorque engine or any forward facing 4 stroke. You could also mount a 4 stroke on it in an east west configuration using the same set of holes as the 2 stroke setup.
I suppose the real question, for me, would be, "what parts do you need to order"? If you need engine parts just specify that it's a GCV135, if you need Chassis parts, generically it's a Victa 460mm utility.
If you need a hand ordering/finding parts don't hesitate to ask and i'm sure we can point you in the right direction.
